Heat exchange – Flow passages for two confined fluids – Interdigitated plural first and plural second fluid passages
Patent
1998-04-23
1999-11-23
Leo, Leonard
Heat exchange
Flow passages for two confined fluids
Interdigitated plural first and plural second fluid passages
165DIG372, F28F 308
Patent
active
059882697
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a plate heat exchanger.
More particularly the invention relates to a plate heat exchanger comprising a front cover plate, a plurality of channel forming plates and a rear cover plate--all being of a basically symmetric shape relative an axis extending in the direction of the length of the exchanger, the said front cover plate being provided with fittings for connections to inlet and outlet ports for heat exchanging media, the said channel forming plates being provided with a pressed pattern.
A heat exchanger should have a large heat exchanging capacity relative to its cost to manufacture and its volume. The cost of manufacture will decrease with decreasing number of parts and with increasing heat exchange capacity per channel forming plate. It is usually desired that equal connection heights are obtained at the inlet and outlet ports for the heat exchanging media and--in case O-ring connections are used--that the sealing, surfaces are located in a common plane at the end surface of the exchanger.
In certain applications, e.g. in case one of the media is of a delicate nature, it is a must that the heat exchanger does not have any blind channels or voids in which some of a heat exchanging medium could be trapped and not hollow the rest of the flow or in which the flow velocity becomes very low. A stop or a very small flow will cause a risk of crevice corrosion or freezing.
The present invention has for its object to provide a plate heat exchanger which better meets these wishes, and this is according to the present invention obtained thereby that even the front cover plate is provided with a pressed pattern, that the areas of said front cover plate around the inlet and outlet ports are located in a common plane, and that the said cover plate together with the adjacent channel forming plate provides a distribution channel crossing the direction between adjacent inlet and outlet ports and bordering areas around said ports in which plane parts of the said cover plate and the adjacent channel forming plate are contacting each other.
The invention will be described below in more detail reference being made to the drawings in which
FIG. 1 is an exploded view showing the basic design of a two circuit plate heat exchanger,
FIG. 2 is a section in the direction of the arrows II--II through a known heat exchanger according to the principle of FIG. 1,
FIG. 3 is a corresponding section through another known plate heat exchanger,
FIG. 4 is a corresponding section through a plate heat exchanger according to the present invention,
FIG. 5 is a plane view of a channel forming plate according to the present invention,
FIG. 6 is a section along the line VI--VI in FIG. 5 at a greater scale,
FIG. 7 is a section along the line VII--VII in FIG. 5--also at a greater scale,
FIG. 8 is a plane view of the front cover plate in the heat exchanger of FIG. 4,
FIG. 9 is a section along the line IX--IX in FIG. 8 at a greater scale,
FIG. 10 is a section along the line X--X in FIG. 8 at a greater scale,
FIG. 11 shows the flow between the front cover plate and an adjacent channel forming plate,
FIGS. 12, 13 and 14 show the rear cover plate,
FIG. 15, 16 and 17 show an alternative design of the front cover plate, and
FIG. 18 is a section corresponding to FIG. 4 through a heat exchanger having the alternative design of the front cover plate shown in FIGS. 15-17 and channel forming plates of known design (FIGS. 2 or 3) and a rear cover plate according to FIGS. 12-14.
FIG. 1 shows a number of mainly rectangularly shaped plates arranged after each other. The plates are of substantially length-symmetric shape--i.e. almost symmetric relative a plane vertically disposed relative the plate through a central line in the plate. The plate designated by 1 is a front cover plate and is followed by a number of channel forming plates 2-7, while the last plate 8 is a rear cover plate. The channel plates 2-7 are of identical shape, but a following channel plate has been turned 180.degree. relative the antecedent one. All channel p
REFERENCES:
patent: 4871017 (1989-10-01), Cesaroni
patent: 4987955 (1991-01-01), Bergqvist et al.
patent: 5462113 (1995-10-01), Wand
Andersson Sven
Dahlberg Thomas
Karlsson Sven
Pihlajaniemi Veikko
Brown Laurence R.
Leo Leonard
SWEP International AB
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